Anonymous

Re: Rolling Screen on GPX D1816

This is synching problem. I did not see any mention of this in the manual or an GPX's site. What I did discover is that many people have problems 2-3 months of use. This tells me that the components are so cheap that they are degrading because of heat after a short while.

My experience with inexpensive DVD players is this: they will not play a lot of DVD because they don't read the Region right. They have synching problems, etc.

I would bring the unit back and get a refund. It's worth it to spend a few more bucks and get a better. Stick w your name brand like Pioneer, Phillips, etc.

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In the old days there was a control at the back of every tv labelled "vertical hold" that needed adjustment when the picture rolled. As tv sets became better that control was at first moved inside the cabinet and then finally deleted.

The vertical hold controlled the amount of synchronising signal (that is extracted from the signal received from the antenna) reached the frame oscillator. Today's electronics are so stable the vertical and horizontal synchronisation is automatic so while sometimes a rolling picture can be caused by a bad signal it almost invariably caused by an internal electronic fault needing the attention of an engineer.

this was adjusted by the fine tune on the selector It is the picture not being held in place by being out of tune Same as if the picture goes sideways On the real old units there were 2 knobs to make these adjustments.

The rolling is a bad filter capacitor on the signal board in the set---Any Mitsubishi dealer can look the model up and see known faults including this one---some of the sets when cold---vertical jitter in picture or just menu---If the menu is stable you have a tiny bad cap= weak caps when cold act up and when get hot regain capacitance and start to work.

The sync is automatic. There are no knobs to turn. If the picture is rolling, look first to the source connection and make sure your tv has a solid vertical sync connection. If you are using the RF input then the issue could be within your small signal board also known as the SSB. Good luck.

is this a horizontal black line going up or down? if yes, this sympton is caused by a trouble in the integrated circuit or in the vertical oscillator circuit.
this symptons has 2 variations. one is the intermittent rolling of the picture. this referred to as the "loose vertical hold" the other variations is the continuous upward or downward rolling of the picture